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| author | Jason Gunthorpe <jgg@mellanox.com> | 2019-07-02 20:34:43 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-07-02 20:34:43 +0300 |
| commit | 9ec3f4cb35bc8278f0582fed9f9229c9315c2ffb (patch) | |
| tree | 3ff6a17a33913268a2ed06e7d9a1a95e29eeee97 /arch/x86/mm/kaslr.c | |
| parent | c5d6c45e90c49150670346967971e14576afd7f1 (diff) | |
| parent | 6fbc7275c7a9ba97877050335f290341a1fd8dbf (diff) | |
| download | linux-9ec3f4cb35bc8278f0582fed9f9229c9315c2ffb.tar.xz | |
Merge tag 'v5.2-rc7' into rdma.git hmm
Required for dependencies in the next patches.
Diffstat (limited to 'arch/x86/mm/kaslr.c')
| -rw-r--r-- | arch/x86/mm/kaslr.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/mm/kaslr.c b/arch/x86/mm/kaslr.c index dc3f058bdf9b..dc6182eecefa 100644 --- a/arch/x86/mm/kaslr.c +++ b/arch/x86/mm/kaslr.c @@ -52,7 +52,7 @@ static __initdata struct kaslr_memory_region { } kaslr_regions[] = { { &page_offset_base, 0 }, { &vmalloc_base, 0 }, - { &vmemmap_base, 1 }, + { &vmemmap_base, 0 }, }; /* Get size in bytes used by the memory region */ @@ -78,6 +78,7 @@ void __init kernel_randomize_memory(void) unsigned long rand, memory_tb; struct rnd_state rand_state; unsigned long remain_entropy; + unsigned long vmemmap_size; vaddr_start = pgtable_l5_enabled() ? __PAGE_OFFSET_BASE_L5 : __PAGE_OFFSET_BASE_L4; vaddr = vaddr_start; @@ -109,6 +110,14 @@ void __init kernel_randomize_memory(void) if (memory_tb < kaslr_regions[0].size_tb) kaslr_regions[0].size_tb = memory_tb; + /* + * Calculate the vmemmap region size in TBs, aligned to a TB + * boundary. + */ + vmemmap_size = (kaslr_regions[0].size_tb << (TB_SHIFT - PAGE_SHIFT)) * + sizeof(struct page); + kaslr_regions[2].size_tb = DIV_ROUND_UP(vmemmap_size, 1UL << TB_SHIFT); + /* Calculate entropy available between regions */ remain_entropy = vaddr_end - vaddr_start; for (i = 0; i < ARRAY_SIZE(kaslr_regions); i++) |